Flue-cutter.



PATENTED DEC. 12, 1905.

J. W. DOYLE.

FLUE CUTTER.

APPLICATION FILED APE.17,1905.

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MTNESJESS A770 NE).

UNITED STATES PATENT OFFICE.

Specification of Letters Patent.

Patented Dec. 12, 190 5.

Application filed pril1'7, 1905. Serial No. 256,132.

To all whom it may concern:

Be it known that I, JOHN W. DOYLE, a citi- Zen of the United States,residing at Seattle, in the county of King and State of Washington, haveinvented certain new and useful Improvements in Flue-Gutters, of whichthe following is a specification.

My invention relates to flue-cutters; and the primary object thereof isto provide a construction which embodies but few parts and is veryeificient in operation.

A further object is to provide improved means for projecting andretracting the cutter-head.

With the above and otherobjects in view, as hereinafter set forth, theinvention consists of the parts, arrangement, and combination of partsdescribed in the following, and

succinctly pointed out in the appended claims.

In the accompanying drawings, wherein like numerals of referenceindicate like parts throughout the several views, Figure l is alongitudinal section of the present invention. Fig. 2 is a section takenon line 2 2 of Fig. 1. Fig. 3 is a fragmentaryview in elevation of thevalve and its supporting means, the outer shell of the valve beingbroken away. Fig. 4 is a fragmentary side view showing the rtary casingremoved from the housing or casing in which it is normally arranged.Fig. 5 is a section taken on line 5 5 of Fig. 1; and Fig. 6 is a detailview of the mandrel, parts being broken away to show the mechanismmounted therein.

In carrying out my invention I provide a housing or casing 1, which hasremovable head 2, and this head and the closed end wall of said housingare both formed with outwardly-projecting castings or sleeves 3 and 4,respectively.

Reference-numeral 5 indicates the inner casing, the same having aremovable head 6, to which-the shaft 7 is rigidly secured in any desiredmanner, a simple means, however, consisting of screws 8, as shown. Thisshaft is rotatable in sleeve 3 and is operated as by means of a crank 9.The mandrel (indicated by reference-numeral 10) is preferably removablysecured to the other end of easing 5 and projects through sleeve 4 andhas fixed thereon by set-screw 11 the collar 12. To this collar a gage13 in the form of a graduated tube is secured by screws 15, which engagein a circumferential groove 16 in said collar for a purpose describedhereinafter. The mandrel is hollow and in the bore thereof I mount alongitudinally-slidable means for projecting and retracting the cutter17, which is rotatably supported in the cutter-headlS. This meanscomprises a bar 19, which is cut out to provide an inclined face onwhich opposite angular flanges 20 (see Fig. 6) are secured. The inturnedportions .of these flanges fit in correspondingly-inclined grooves 21 inthe sides of the cutter-head. Consequently when said bar 19 is movedlongitudinally of the mandrel said cutter-head will be alternatelyprojected and retracted, it being understood thattsaid cutter-head atall times has snug engagement in the opening 22 of the mandrel and isthereby prevented from any longitudinal movement with said bar. (SeeFigs. 1 and Reference-numeral 23 indicates a piston which is slidable incasing 5 and secured to the adjacent end of bar 19, and this piston isreciprocated by alternately admitting a motive fluid-as, for example,air or the like-into casing 5 on opposite sides of said piston.

The housing or outer casing 1 is formed with an elongated neck orcasting 23, and this casting is bored to provide channels 24. Thesechannels always register with-circumferential grooves 25, formed incasing 5, and therefore the air or other motive fluid can be admittedinto eitherof said grooves 25, so as to pass through apertures 26 intocasing 5 on either side of piston 23, this depending on the set of thevalve which I will nowproceed to describe. 7 shell 27, which has astem27 rotatably fitting in a socket in neck 23, an intermediate shell 28,which is threaded onto the neck, and an outer shell 29, which isrotatable on shell 28, and a pin 30 connects the inner and outer shells,the same passing through a slot 31 in the intermediate shell. Thereforethe said outer and inner shells can be moved in unison about said shell28. The inner shell has its bottom formed with inlet and outlet ports orducts 32 and 33, respectively, which alternately register with therespective channels 24. The inlet-port extends entirely through thebottom of said inner shell, and consequently when air is admitted intosaid inner shell it will pass through said port 32,- and the channel 24,groove 25, and apertures 26 registering therewith into casing 5 anddrive the piston to the position shown in Fig. 1. The exhaust port orduct 33, however, is of angular form, and while its lower end willregister with either of channels 24 its upper The valve consists of aninner end terminates at the side of said inner shell and alternatelyregisters with exhaust-channels 34, formed in the intermediate and outershells. Therefore, assuming that the piston has been moved to theposition shown in Fig. 1, as previously described, that air which was inthe casing 5 in advance of the piston was expelled through the adjacentchannel 24, the exhaust port or duct 33, and channel 34. To advance thepiston, the operator grasps the outer shell and rotates the sameone-half of a revolution in the direction of the arrow, (see Fig. 2,)thereby causing the inlet and outlet ports to assume a reversed positionwith respect to channels 24. The motive fluid is thereby admitted intothe casing 5 in the rear of the piston. The mandrel is rotatedsimultaneously with the advance movement of the piston, and the cutterbeing gradually projected beyond the mandrel will impinge against theflue, which is normally arranged thereon, and sever the same. Suitablestops, as 35, prevent the piston moving past the respective series ofapertures 26.

In operation the mandrel is slipped into the flue, or vice versa, andthe gage will then inclose said flue, and in order that the operatorwill be fully aware of the length of flue arranged in said gage I slotthe same longiatudinally, as at 37, whereby sight-openings are provided.After the mandrel has been advanced the required distance into the flueair is admitted into casing 5 to project the cutter, and the mandrel isthen rotated, as heretofore stated. The gage by reason of its connectionwith collar 12, the screws 15 engaging in the circumferential groove 16thereof, Wlll be allowed to remain free from movement with the mandrelshould the same I claim as new, and desire to secure by Letters Patentof the United States of America, is-

1. A flue cutter comprising a housing formed with channels, a casingrotatable in the housing and being formed with continuous groovesregistering with said channels, said casing having aperturescommunicating with said grooves, a valve formed with inlet and outletports alternately registering with said channels, a piston operating insaid casing, a mandrel secured to said casing, a cutter slid ablymounted in said mandrel, and means actuated by said piston forprojecting and retracting said cutter.

2. A fluecutter comprising a housing formed with channels, a rotaryvalve secured thereto and having inlet and outlet ports alternatelyregistering with the respective channels of the housing, a casing formedwith apertures to receive a motive fluid from said channels, a pistonslidable in the casing, a mandrel rotated by said casing, a cutterslidable in said mandrel, means actuated by said piston for projectingand retracting said cutter.

3. A flue cutter comprising a housing formed withchannels, a casingrotatable in the housing, means for rotating the same, a piston slidablein said casing and being driven by a motive fluid received from thechannels in said housing, a mandrel secured to said casing, a cuttermovable into and out of the mandrel, and means actuated by said pistonfor projecting and retracting said cutter.

4:. A flue cutter comprising a housing formed with a neck havingchannels, a rotary valve mounted on said neck and having inlet andoutlet ports alternately registering with the respective channelsthereof, a rotary casing in said housing formed with apertures toreceive motive fluid from said channels, a piston slidable in thecasing, a mandrel-rotated by said casing, a cutter slidable in saidmandrel, and means actuated by said piston for projecting and retractingsaid cutter.

5. A flue -cutter comprising a housing having a neck formed withchannels, a rotary valve removably secured to the neck of said housingand having inlet and outlet ports alternately registering with therespective channels thereof, a casing formed with apertures to receive amotive fluid from said channels, a piston slidable in the casing, amandrel rotated by said casing, a cutter slidable in said mandrel, meansactuated by said piston for projecting and retracting said cutter.

6. A flue-cutter comprising a housing formed with a neck havingchannels, a rotary valve comprising an inner shell formed with inlet andoutlet ports adapted to alternately register with the respectivechannels, a shell fixed to said neck and inclosing the first shell, andan outer shell connected to said inner shell, a casing rotatable in saidhousing and being formed with apertures to receive a motive fluid fromsaid channels, a piston slidable in the casing, a mandrel rotated bysaid casing, a cutter slidable in the mandrel, and means actuated by thepiston for sliding said cutter.

In testimony whereof I aifix my signature in presence of two witnesses.

JOHN WV. DOYLE.

LOO

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